物理化学学报 >> 2014, Vol. 30 >> Issue (1): 194-204.doi: 10.3866/PKU.WHXB201311053

材料物理化学 上一篇    

新形金纳米片的简单制备与生长机制

王长顺1, 阚彩侠1,2, 倪媛1, 徐海英1   

  1. 1 南京航空航天大学理学院应用物理系, 南京 211106;
    2 南京航空航天大学, 纳智能材料器件教育部重点实验室, 南京 211106
  • 收稿日期:2013-08-23 修回日期:2013-11-04 发布日期:2014-01-01
  • 通讯作者: 王长顺, 阚彩侠 E-mail:cxkan@nuaa.edu.cn,changshun@nuaa.edu.cn
  • 基金资助:

    南京航空航天大学基本科研项目(NZ2013204)资助

Facile Preparation and Growth Mechanism of New-Type Gold Nanoplates

WANG Chang-Shun1, KAN Cai-Xia1,2, NI Yuan1, XU Hai-Ying1   

  1. 1 Department of Applied Physics, College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, P. R. China;
    2 Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, P. R. China
  • Received:2013-08-23 Revised:2013-11-04 Published:2014-01-01
  • Contact: WANG Chang-Shun, KAN Cai-Xia E-mail:cxkan@nuaa.edu.cn,changshun@nuaa.edu.cn
  • Supported by:

    The project was supported by the Nanjing University of Aeronautics and Astronautics Fundamental Research Funds, China (NZ2013204).

摘要:

在室温(~30 ℃)条件下,氯金酸(HAuCl4)均匀混合在粘稠的表面活性剂聚乙烯吡咯烷酮(PVP)胶体(水为溶剂)中,HAuCl4可以被PVP还原,从而形成纳米片. 本工作中,通过调整晶体生长条件,成功合成了大量新形貌的单晶金纳米片(厚度数十纳米,尺寸为数个微米). 例如,在晶体生长初期阶段,通过引入温度变化(如降温10-20 ℃),形成的金纳米片主要是六角星形,并伴有盾状、内凹外凸的三角状、截角的、三叉的及多台阶等新形纳米片. 结合理论计算,阐明了金纳米片的生长机制:在一定条件下,金(111)晶面不仅可以沿着<110>方向生长成为常规的三角或六角纳米片,还可以沿<211>、<321>等不同方向生长成含有更高指数侧面的新形金纳米片.

关键词: 金纳米片, 聚乙烯吡咯烷酮, 星形, 生长机制, 高指数面

Abstract:

When a sticky gel consisting of an aqueous HAuCl4 solution mixed with poly-vinylpyrrolidone (PVP) surfactant is kept at room temperature (about 30 ℃), the HAuCl4 is reduced by the PVP, resulting in the formation of nanostructures. In this study, gold nanoplates with new shapes, which were single crystalline, several micrometers wide, and tens of nanometers thick, were mass-synthesized by adjusting the crystal growth conditions. For example, through inducing temperature decrease (10-20 ℃) in the early stage of crystal growth, the product is dominated by star-like gold nanoplates, together with other new shapes such as shields, concave and convex triangles, corner snipped shapes, triple branched shapes, and shapes that are step-rich in the side plane. Based on theoretical calculations, we present the growth mechanism of these new gold nanoplates. Under certain growth conditions, the (111) plane of the gold crystal can grow not only along the <110> direction into regular triangular or hexagonal nanoplates, but also along other directions such as <211> and <321>, to give new nanoplates with high-index side facets.

Key words: Gold nanoplate, Poly-vinylpyrrolidone, Star-like shape, Growth mechanism, High-index facet

MSC2000: 

  • O648